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Generation of noise-like pulses and soliton rains in a graphene mode-locked erbium-doped fiber ring laser

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Frontiers of Information Technology & Electronic Engineering 2021年第3期22卷 303-311页

作者： pinghua tang Mulin LUO Ting ZHAO Yuliang MAO Hunan Key Laboratory for Micro-Nano Energy Materials and Devices School of Physics and OptoelectronicsXiangtan UniversityXiangtan 411105China School of Electronic Engineering Nanjing Xiaozhuang UniversityNanjing 211171China

We demonstrate the generation of noise-like pulses(NLPs)and soliton rains in a graphene saturable absorber modelocked erbium-doped fiber *** NLPs are obtained at a proper pump power and in a cavity polarization *** soliton rain operation with multiple solitons can be achieved by finely adjusting the cavity polarization *** addition,distinctive multi-soliton interactions are observed and investigated,including the fundamental mode-locking and multiple *** experimental results can help further understand nonlinear pulse dynamics in ultrafast optics.

关键词： Erbium-doped fiber lasers Graphene Saturable absorption Passive mode-locking

Broadband mid-infrared nonlinear optical modulator enabled by gold nanorods:towards the mid-infrared regime

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Photonics Research 2019年第6期7卷 699-704页

作者： BIN HUANG ZHE KANG JIE LI MINGYI LIU pinghua tang LILI MIAO CHUJUN ZHAO GUANSHI QIN WEIPING QIN SHUANGCHUN WEN PARAS N.PRASAD Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education & Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and Electronics Hunan University Changsha 410082 China State Key Laboratory on Integrated Optoelectronics College of Electronic Science & Engineering Jilin University Changchun 130012 China Changchun Observatory National Astronomical Observatories Chinese Academy of Sciences Changchun 130117 China Hunan Key Laboratory for Micro-Nano Energy Materials and Devices Xiangtan University Xiangtan 411105 China Institute for Lasers Photonics Biophotonics University at Buffalo State University of New York Buffalo New York 14260 USA

Mid-infrared pulsed lasers operating around the 3 μm wavelength regime are important for a wide range of applications including sensing, spectroscopy, imaging, etc. Despite the recent advances in technology, the lack of a nonlinear optical modulator operating in the mid-infrared regime remains a significant challenge. Here, we report the third-order nonlinear optical response of gold nanorods(GNRs) ranging from 800 nm to the mid-infrared regime(2810 nm) enabled by their size and overlapping behavior-dependent longitudinal surface plasmon resonance. In addition, we demonstrate a wavelength-tunable Er3+-doped fluoride fiber laser modulated by GNRs, which can deliver pulsed laser output, with the pulse duration down to 533 ns, tunable wavelength ranging from 2760.2 to 2810.0 nm, and spectral 3 d B bandwidth of about 1 nm. The experimental results not only validate the GNRs’ robust mid-infrared nonlinear optical response, but also manifest their application potential in high-performance broadband optoelectronic devices.

关键词： optical modulator mid-infrared regime

Exponential synchronization for neural networks with mixed time-varying delays via periodically intermittent control

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International Journal of Biomathematics 2014年第2期7卷 103-120页

作者： pinghua Yang Xinan tang Department of MathematicsShijiazhuang Mechanical Engineering College Shijiazhuang 050003 P. R. China

This paper deals with exponential synchronization for a class of neural networks with mixed time-varying delays via periodically intermittent control. Some novel and effective exponential synchronization criteria are derived by constructing Lyapunov functional and applying some analysis techniques. These results presented in this paper generalize and improve many known results. Finally, this paper presents an illustrative example and uses the simulated results to show the feasibility and effectiveness of the proposed scheme.

关键词： Exponential synchronization neural networks mixed time-varying delays periodically intermittent control.

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降低炼油水洗废水含油率措施研究及应用

中国油脂 2012年第9期37卷 23-26页

作者：唐萍华上海良友海狮油脂实业有限公司上海200231

采用单因素敏感性分析方法,从大豆油碱炼工段加酸、加碱、皂脚-油脂分离、水洗等方面进行研究,摸索出水洗废水含油率最低的工艺条件:大豆毛油在85℃、960 r/min的搅拌速度下与磷酸混合,反应40 min;降温到75℃,在960 r/min的搅拌速度下... 详细信息

采用单因素敏感性分析方法,从大豆油碱炼工段加酸、加碱、皂脚-油脂分离、水洗等方面进行研究,摸索出水洗废水含油率最低的工艺条件:大豆毛油在85℃、960 r/min的搅拌速度下与磷酸混合,反应40 min;降温到75℃,在960 r/min的搅拌速度下与烧碱混合,反应15 min,升温到90℃进行油-皂分离;油脂在960 r/min的搅拌速度下与热水、磷酸混合,反应5 min,进行油-水分离。经小试验证,并投入工业化生产应用。

关键词：水洗废水含油率油脂精炼碱炼应用

Controllable growth of wafer-scale PdS and PdS_(2) nanofilms via chemical vapor deposition combined with an electron beam evaporation technique

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Journal of Semiconductors 2023年第12期44卷 64-71页

作者： Hui Gao Hongyi Zhou Yulong Hao Guoliang Zhou Huan Zhou Fenglin Gao Jinbiao Xiao pinghua tang Guolin Hao School of Physics and Optoelectronics and Hunan Institute of Advanced Sensing and Information Technology Xiangtan UniversityXiangtan 411105China College of Physics and Technology&Guangxi Key Laboratory of Nuclear Physics and Technology Guangxi Normal UniversityGuilin 541004China Department of Electronic and Electrical Engineering University of SheffieldSheffield S102TNUK National Laboratory of Solid State Microstructures Nanjing UniversityNanjing 210093China

Palladium(Pd)-based sulfides have triggered extensive interest due to their unique properties and potential applications in the fields of electronics and ***,the synthesis of large-scale uniform PdS and PdS_(2)nanofilms(NFs)remains an enormous *** this work,2-inch wafer-scale PdS and PdS_(2) NFs with excellent stability can be controllably prepared via chemical vapor deposition combined with electron beam evaporation *** thickness of the pre-deposited Pd film and the sulfurization temperature are critical for the precise synthesis of PdS and PdS_(2) NFs.A corresponding growth mechanism has been proposed based on our experimental results and Gibbs free energy *** electrical transport properties of PdS and PdS_(2) NFs were explored by conductive atomic force *** findings have achieved the controllable growth of PdS and PdS_(2) NFs,which may provide a pathway to facilitate PdS and PdS_(2) based applications for next-generation high performance optoelectronic devices.

关键词： PdS PdS_(2) nanofilms controllable growth chemical vapor deposition electron beam evaporation

2.8μm自相似锁模掺铒氟化物光纤激光器的数值研究

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激光与光电子学进展 2022年第13期59卷 289-296页

作者：曾广民彭杰唐平华湘潭大学物理与光电工程学院湖南湘潭411105

数值研究了中红外2.8μm波段基于可饱和吸收体(SA)锁模掺铒氟化物光纤激光器中自相似脉冲的产生及演化过程。结果表明:通过锗棒进行色散补偿使腔内净色散为0.020~0.048 ps2时,基于SA锁模的掺铒氟化物光纤激光器腔内脉冲可维持自相似演化... 详细信息

数值研究了中红外2.8μm波段基于可饱和吸收体(SA)锁模掺铒氟化物光纤激光器中自相似脉冲的产生及演化过程。结果表明:通过锗棒进行色散补偿使腔内净色散为0.020~0.048 ps2时,基于SA锁模的掺铒氟化物光纤激光器腔内脉冲可维持自相似演化;保持腔内净色散为0.03 ps2,可以获得抛物线形状最理想的脉冲,其脉冲宽度为19.7 ps、峰值功率为630 W、脉冲能量为12.4 nJ。为了进一步优化激光器的输出特性,研究了增益光纤的小信号增益、增益饱和能量以及SA的调制深度、饱和功率等参数对激光器脉冲输出特性的影响,为自相似锁模掺铒氟化物光纤激光器的设计提供了一定的参考。

关键词：激光光学中红外抛物线脉冲氟化物光纤激光器

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调和煎炸油的研制及其煎炸性能

中国油脂 2008年第10期33卷 11-14页

作者：冯承唐萍华上海良友海狮油脂实业有限公司上海200231

以大豆油、棕榈油、棉籽油和玉米油为原料制成调和煎炸油,对原料油及调和煎炸油的抗氧化能力进行了测定,结合冷藏实验选出最佳配方为:大豆油60%,棉籽油25%,玉米油10%,棕榈油5%。测试了调和煎炸油在煎炸过程中脂肪酸组分、酸值、过氧化... 详细信息

以大豆油、棕榈油、棉籽油和玉米油为原料制成调和煎炸油,对原料油及调和煎炸油的抗氧化能力进行了测定,结合冷藏实验选出最佳配方为:大豆油60%,棉籽油25%,玉米油10%,棕榈油5%。测试了调和煎炸油在煎炸过程中脂肪酸组分、酸值、过氧化值、羰基值等指标的变化。结果表明,过氧化值、酸值、羰基值在煎炸期间符合《食用植物油煎炸过程中的卫生标准》的要求。

关键词：煎炸油调和油羰基值理化指标

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定子无铁心飞轮电机绕组涡流损耗分析

电工技术学报 2010年第3期25卷 27-32页

作者：汤平华漆亚梅黄国辉李铁才哈尔滨工业大学电气工程系哈尔滨150001 深圳航天科技创新研究院深圳518057

定子无铁心飞轮电机的绕组完全暴露于变化的磁场中,高速运行时绕组导体产生的涡流损耗很大,严重影响电机效率。本文推导了圆形导体在变化磁场中的涡流损耗模型,进而建立了飞轮电机绕组涡流损耗的计算模型。涡流损耗模型由两部分组成,一... 详细信息

定子无铁心飞轮电机的绕组完全暴露于变化的磁场中,高速运行时绕组导体产生的涡流损耗很大,严重影响电机效率。本文推导了圆形导体在变化磁场中的涡流损耗模型,进而建立了飞轮电机绕组涡流损耗的计算模型。涡流损耗模型由两部分组成,一部分是由径向磁场产生的损耗,另一部分是由切向磁场产生的损耗,径向磁场和切向磁场可以通过求解电机静磁场或有限元仿真计算得到。文章结合有限元仿真计算得到的磁场对绕组的涡流损耗进行了估算,并对飞轮电机样机进行实验,实验结果证明了相关理论的正确性。

关键词：无铁心飞轮电机绕组涡流损耗

葵花籽原油中胶质与蜡含量快速测定方法的探讨

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粮食与食品工业 2014年第3期21卷 90-92页

作者：唐萍华上海良友海狮油脂实业有限公司上海200231

通过研究葵花籽原油中胶质与蜡含量的快速检测方法,利用此方法测定葵花籽原油中胶质与蜡的含量,并把实验结果与葵花籽原油连续精炼生产实践相结合,确立了葵花籽原油中胶质与蜡的含量的接收标准。实践证明,该方法简单,检测时间短,检测结... 详细信息

通过研究葵花籽原油中胶质与蜡含量的快速检测方法,利用此方法测定葵花籽原油中胶质与蜡的含量,并把实验结果与葵花籽原油连续精炼生产实践相结合,确立了葵花籽原油中胶质与蜡的含量的接收标准。实践证明,该方法简单,检测时间短,检测结果可靠。

关键词：葵花籽原油蜡胶质冬化脱蜡